Light glows for every 18 seconds .

Light glows for every 18 seconds . How many times did it between 1:57:58 and 3:20:47 am

Quiz

Answer/Solution

277

Steps/Work

the diff in sec between 1:57:58 and 3:20:47 is 4969 sec, 4969/18 = 276.
so total 277 times light ll glow
ANSWER:B